Drake II flapper

I've submitted an email question to Toto, but in the meantime thought I might ask here since Terry seems to install quite a few of these. I installed a Drake II in April, 2012 and the tank (ST454E) contained a red flapper with a weight on the chain. I just bought another one yesterday (Dec, 2012), same exact model tank (ST454E) and it contains a gray flapper with no weight on the chain. Was there a design change, or is this a manufacturing error?

There's more than one way to skin the cat (as they used to say)...it's certainly less trouble to manufacture things with one less part to assemble. And, the float can't come off and get lodged in the waterway, either (not common, but could happen). Sounds like progress.